With regard to the thymic medulla (ANAT2020 only): It contains epithelioreticular cells.

Correct Answer: A

Rationale: Epithelioreticular cells are key components of the thymic medulla, aiding T-cell development.

Correct Answer: A

Rationale: Spleen trabeculae divide it into irregular compartments, not regular or cortex/medulla like lymph nodes.

Correct Answer: D

Rationale: Thymus stroma has a thin C.T. capsule , incomplete trabeculae , and reticular C.T. ; it does not have a thick capsule (D is incorrect).

Correct Answer: B

Rationale: Billroth cords in spleen red pulp are infiltrated with blood and lymphoid cells ; they're not in lymph nodes or between follicles , and lack central arterioles .

Correct Answer: C

Rationale: Th17 responses recruit neutrophils to fight extracellular pathogens; monocytes and eosinophils are less characteristic.